wished to attract the attention of the two sisters, he would have to make use of some such alarm signals as mad-doctors adopt in dealing with their distracted patients; as by beating several times on a glass with the blade of a knife, fixing them at the same time with a sharp word and a compelling glance, violent methods which the said doctors are apt to bring with them into their everyday life among the sane, either from force of professional habit or because they think the whole world a trifle mad.
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